TDA2030 "protection diodes"

db! · 07:12 AM

I'm looking to build an amp with some TDA2030 chips and I'm wondering if the "protection diodes" are really needed. According to the datasheet, they're there to protect against "output voltage spikes" but all the other TDA20xx series chips don't seen to require them. Are they really necessary or can I simply do without them?

Any advice would be appreciated!

diego german · 14th April 2011, 07:58 AM

if included in the data sheet I think you should put as for each IC must change values of some components varies TDA2040/50 snubber network ...

Greetings

PS: I am translating with google please forgive me if something is not understood

coresta · 14th April 2011, 10:07 AM

Yes for sure you should put them , as any other solid state amp : I prefer shottkys but any cancel of loudspeaker's feedback is good to protect the final stage

yexin626 · 14th April 2011, 11:27 AM

Cancel the diodes, this can have a try!

johnr66 · 14th April 2011, 03:04 PM

Are you using the chip alone or as a driver for discreet devices (TDA2030A)?

What is your supply voltage? As a driver, or when using the chip at higher voltages, I'd add the diodes.

I'd also select the TDA2050 or LM1875 because they allow for higher output currents which means you can use higher Vs when used alone for more Po. They don't need the diodes as they are internal.

db! · 14th April 2011, 05:07 PM

Thanks for the replies guys!

The supply will be around +-17v. The chip is being used alone to drive speakers. The reason I'm using the TDA2030 is because I have a whole bunch of them.
Is there any real harm in eliminating the diodes?

digits · 14th April 2011, 05:38 PM

how eaily can you replace speakers is the only question.

martin clark · 14th April 2011, 07:01 PM

No you can eliminate the diodes if you have a bunch of TDA2030s spare.

All the diodes do is 'catch' any reactive output - i.e. it clamps the voltage swing possible at the amps output to the supply rails + (or -) about 0.7v, to protect the TDA2030 output stage. Overkill, really, but for the cost of two diodes very cheap insurance. They do not affect the amps measured or perceived performance.

AndrewT · 15th April 2011, 10:24 AM

One can also add diodes across the PSU to prevent excessive reverse charging of the capacitors.

These 4 diodes cost pennies or a few more cents. Very cheap insurance.

14th April 2011, 07:02 AM	#1
db! diyAudio Member Join Date: Nov 2009 Location: Ontario	TDA2030 "protection diodes" I'm looking to build an amp with some TDA2030 chips and I'm wondering if the "protection diodes" are really needed. According to the datasheet, they're there to protect against "output voltage spikes" but all the other TDA20xx series chips don't seen to require them. Are they really necessary or can I simply do without them? Any advice would be appreciated! Last edited by db!; 14th April 2011 at 07:12 AM.

15th April 2011, 10:24 AM	#9
AndrewT diyAudio Member Join Date: Jul 2004 Location: Scottish Borders	One can also add diodes across the PSU to prevent excessive reverse charging of the capacitors. These 4 diodes cost pennies or a few more cents. Very cheap insurance. __________________ regards Andrew T.

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14th April 2011, 07:58 AM	#2
diego german diyAudio Member Join Date: Jul 2009 Location: Ecuador	if included in the data sheet I think you should put as for each IC must change values of some components varies TDA2040/50 snubber network ... Greetings PS: I am translating with google please forgive me if something is not understood

14th April 2011, 10:07 AM	#3
coresta diyAudio Member Join Date: Mar 2005 Location: Paris	Yes for sure you should put them , as any other solid state amp : I prefer shottkys but any cancel of loudspeaker's feedback is good to protect the final stage

14th April 2011, 11:27 AM	#4
yexin626 diyAudio Member Join Date: Apr 2011	Cancel the diodes, this can have a try!

14th April 2011, 03:04 PM	#5
johnr66 diyAudio Member Join Date: Mar 2009	Are you using the chip alone or as a driver for discreet devices (TDA2030A)? What is your supply voltage? As a driver, or when using the chip at higher voltages, I'd add the diodes. I'd also select the TDA2050 or LM1875 because they allow for higher output currents which means you can use higher Vs when used alone for more Po. They don't need the diodes as they are internal.

14th April 2011, 05:07 PM	#6
db! diyAudio Member Join Date: Nov 2009 Location: Ontario	Thanks for the replies guys! The supply will be around +-17v. The chip is being used alone to drive speakers. The reason I'm using the TDA2030 is because I have a whole bunch of them. Is there any real harm in eliminating the diodes?

14th April 2011, 05:38 PM	#7
digits diyAudio Member Join Date: Apr 2011	how eaily can you replace speakers is the only question.

14th April 2011, 07:01 PM	#8
martin clark diyAudio Member Join Date: Jul 2003 Location: Bath, UK	No you can eliminate the diodes if you have a bunch of TDA2030s spare. All the diodes do is 'catch' any reactive output - i.e. it clamps the voltage swing possible at the amps output to the supply rails + (or -) about 0.7v, to protect the TDA2030 output stage. Overkill, really, but for the cost of two diodes very cheap insurance. They do not affect the amps measured or perceived performance.

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